Fallow - Dead Code Analysis

Version updated for https://github.com/fallow-rs/fallow to version v1.8.1.

  • This action is used across all versions by 1 repositories.

Action Type

This is a Composite action.

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Action Summary

This GitHub Action, “fallow,” is a high-performance codebase analyzer for TypeScript and JavaScript projects, built in Rust. It automates the detection of unused code (e.g., files, exports, dependencies), circular dependencies, duplicate code, and high-complexity functions, enabling developers to optimize and maintain cleaner, more efficient codebases. With its speed and comprehensive analysis, it addresses common code quality and maintainability challenges, significantly outperforming comparable tools.

Release notes

LSP Fixes

  • Pull-model diagnostics — Resolves textDocument/diagnostic errors in Cursor and VSCodium
  • Precise import ranges — Unresolved import squiggly now covers only the module specifier ('./missing'), not the entire import line
  • Correct diagnostic positions — Unused dependencies appear on their package.json line, circular deps on the import that starts the cycle
  • Full first-line highlight for file-level diagnostics (unused files, unlisted deps)
  • Multi-root workspace — LSP discovers monorepo workspaces and analyzes each package independently
  • Stale diagnostic cleanup — Resolved issues are cleared from the pull-model cache

Internal

  • Major refactoring: split large modules into focused submodules across graph, extract, core, and LSP crates
  • Improved test coverage with 50+ new unit tests
  • Extract cache version bumped to 16 (ImportInfo.source_span)

Full Changelog: https://github.com/fallow-rs/fallow/compare/v1.8.0...v1.8.1